GB2165109A - Stop-lamp circuit failure detection system - Google Patents
Stop-lamp circuit failure detection system Download PDFInfo
- Publication number
- GB2165109A GB2165109A GB08522961A GB8522961A GB2165109A GB 2165109 A GB2165109 A GB 2165109A GB 08522961 A GB08522961 A GB 08522961A GB 8522961 A GB8522961 A GB 8522961A GB 2165109 A GB2165109 A GB 2165109A
- Authority
- GB
- United Kingdom
- Prior art keywords
- circuit
- lamp
- stop
- detection system
- failure detection
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/0054—Detection of the synchronisation error by features other than the received signal transition
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
- B60Q11/00—Arrangement of monitoring devices for devices provided for in groups B60Q1/00 - B60Q9/00
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/0054—Detection of the synchronisation error by features other than the received signal transition
- H04L7/0062—Detection of the synchronisation error by features other than the received signal transition detection of error based on data decision error, e.g. Mueller type detection
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/0079—Receiver details
- H04L7/0083—Receiver details taking measures against momentary loss of synchronisation, e.g. inhibiting the synchronisation, using idle words or using redundant clocks
Abstract
A failure detection system in an automobile stop-lamp circuit (1) which serves to turn on a stop lamp (STP-LMP) when a brake switch (BK-SW) is closed in normal operation of a vehicle braking system. The failure detection system includes a control circuit (3) which is so constructed that a power circuit for an alarm lamp (ALM-LMP) is set to turn on the alarm lamp for a predetermined time when an ignition switch (TG-SW) is closed and then the power circuit is broken by turning on the brake switch. This system permits easy detection of failure in the stop lamp circuit as well as testing of the alarm lamp itself. <IMAGE>
Description
SPECIFICATION
Stop-lamp circuit failure detection system
This invention relates to a failure detection system in a stop-lamp circuit which serves to turn on a stop lamp when a brake switch is closed by operating a brake of an automobile.
A circuit diagram of a conventional detecting system for detecting a fault in a stop lamp circuit of an automobile at a time of inspection before starting the automobile is shown in Figure 1 of the accompanying drawings. In this circuit when a battery switch BAT-SW is closed to close a main switch M-SW (at this stage, an ignition switch IG SW is held in its OFF-position a), a pilot lamp P
LMP is turned on unless stop lamps STP-LMP fail to illuminate. Thus, an indication is given that the stop lamp circuit is in a normal state. If, then, a brake is operated to switch on a brake switch BK
SW, and if the brake switch operates in normal manner, an electric current passes through the brake switch, without passing through the pilot lamp P-LMP which has higher resistance than that of the stop lamps STP-LMP, so that pilot lamp P
LMP is switched off.Thus the operation of the brake switch BK-SW is inspected. There are, however, some drawbacks in this conventional detecting system. For example, since the system is so constructed that the insertion is effected while the engine of the vehicle is stopped, the battery of the vehicle is subjected to drain. Furthermore, the system cannot given an indication of occurrence of a failure such as malfunction or breakage of the stop lamp circuit while the brake switch BK-SW is in the closed state, and there is no inspection of the alarm lamp ALM-LMP itself.
According to the present invention there is provided a failure detection system in a stop-lamp circuit which serves to turn on a stop lamp when braking operation normally involving turning on of a brake switch is effected; the system comprising means for detecting a state of malfunction of the stop lamp circuit and feeding an operation instruction to a driver means to drive an alarm means, and means for closing a power circuit for the alarm means to cause the alarm means to operate for a predetermined period set by a timer after closing of an ignition switch and opening the power circuit for the alarm means by turning on the brake switch during the period set by the timer. By this failure detection system, occurrence of failure in the stop lamp circuit can be easily detected and the alarm lamp itself can be inspected.
For a better understanding of the invention and to show how the same may be carried into effect, reference will now be made, by way of example, to
Figures 2 and 3 of the accompanying drawings, in which:
Figure 2 is a brief circuit diagram of a failure detection system in a stop-lamp circuit; and
Figure 3 is a detailed circuit diagram of the system shown in Figure 2.
Referring to Figure 2, the system as shown in
Figure 2 comprises a stop lamp circuit 1 including a brake switch BK-SW having a contact arranged to be closed when a brake of an automobile is operated, a stop lamp STP-LMP arranged to be turned
ON by a signal fed through said brake switch BK SW and a relay switch RL-SW having a relay contact arranged to be opened when a failure such as breakage of the stop lamp STP-LMP, breakage of a wire or the like occurs, an alarm lamp circuit 2 including an alarm lamp ALM-LMP and a driver
DRIV, said alarm lamp ALM-LMP being arranged to be turned ON by a signal fed through said driver
DRIV when the relay contact of said relay switch is opened, and a control circuit 3 which controls ON and OFF of the alarm lamp ALM-LMP in accordance with the states of operation of the ignition switch IG-SW and the brake switch BK-SW, thereby effecting inspection of the operation of the alarm lamp ALM-LMP and the brake switch BK-SW.
The control circuit 3 functions as a RS flip-flop circuit. When the ignition switch IG-SW is turned
ON, a set output is fed to the driver DRIV of the alarm lamp circuit 2 as an instruction signal to turn
ON the alarm lamp ALM-LMP. Then, when the brake switch BK-SW is turned ON, a reset output is fed to the driver DRIV of the alarm lamp circuit 2 as an instruction signal to turn OFF the alarm lamp
ALM-LMP. If a failure of the brake switch BK-SW occurs, no instruction to turn OFF the alarm lamp is fed to the alarm lamp circuit 2.
Figure 2 shows detailed construction of the control circuit 3 and the driver DRIV.
Firstly, a description will be given of the operation of the system shown in Figure 3, when the stop lamp circuit 1 is in normal state.
When the ignition switch IG-SW is closed (at this stage, the brake switch BK-SW is held at its OFFposition), a base current is fed to the transistor Q3 through the circuit of the resistor R6 and the diode D5 in the control circuit 3. The transistor Q3 is turned ON and thus a power circuit for the alarm lamp ALM-LMP in the alarm lamp circuit 2 is formed through the diode D6 and the transistor
Q3, independently of the driver DRIV, so that the alarm lamp is turned on. At this stage, the transistor 02 in the control circuit 3 is held in its OFFstate, since this transistor has a timer circuit including a resistor R5 and a capacitor C2 connected to the base of this transistor Q2 and this timer circuit has high value of time constant.If the ignition switch IG-SW is closed, the transistor Q1 is turned
ON, whereby the point A in the alarm lamp circuit 2 is short-circuited through the relay switch RL-SW and the stop lamp STP-LMP. The input signal of the driver DRIV becomes low level, so that the driver DRIV itself feeds no instruction to the alarm lamp ALM-LMP to turn on the same. The time constant is so determined that the stop lamp STP-LMP does not turn on when the transistor Q1 is held
ON.
If the brake is operated within the set time of said timer circuit, thereby turning ON the brake switch BK-SW in the stop lamp circuit 1,the base current passes at a moment through the transistor
Q2 by way of the circuit including the resistor R3 and the capacitor Cl, to hole the transistor Q2 in its ON-state, whereby the base of the transistor Q3 is short-circuited and the transistor Q3 is turned
OFF. The power circuit of the alarm lamp ALM
LMP in the alarm lamp circuit 2 is broken and the lamp is turned off. At this stage, if the brake switch
BK-SW is turned ON, the transistor Q1 is turned
OFF.However, the point A in the alarm lamp circuit is short-circuited through the relay contact of the relay switch RL-SW, which is closed owing to the energization of the relay coil of said relay switch RL-SW, so that the input signal of the driver
DRIV becomes low level. Accordingly, the driver
DRIV itself feeds no instruction to the alarm lamp
ALM-LMP to turn on the same.
Thus, whether the alarm lamp ALM-LMP and the brake switch BK-SW operate in the normal manner or not can be inspected by the steps of turning ON the ignition switch IG-SW at the time of starting the engine, turning on the alarm lamp ALM-LMP, and then operating the brake, thereby turning off the alarm lamp ALM-LMP.
Next, a description will be given of the operation of this system when failure occurs in the stop lamp circuit 1.
At the time of failure of the brake switch BK-SW, the alarm lamp ALM-LMP is not turned off but is held in turned-on state even if the brake is operated after closing the ignition switch IG-SW. That is, when a failure occurs when the brake switch
BK-SW is opened, ON-signal is not fed to the transistor Q2 through the brake switch BK-SW even if the brake is operated, and consequently the transistor Q3 is kept in ON-state. When a failure occurs while the brake switch BK-SW is in its closed state,
ON-signal is not fed to the transistor Q2 and therefore the transistor Q3 is held in its ON-state even if the brake is operated, since the capacitor C1 has been already kept in charged state before the ignition switch IG-SW is turned ON.
At breakage of a fuse F in the stop lamp circuit 1, breakage at a point B or breakage of the stop lamp
STP-LMP, the point A in the alarm lamp circuit 2 becomes high level when the ignition switch IG
SW is closed, since the transistor Q1 is in OFFstate in any of these cases, and therefore the alarm lamp ALM-LMP is turned on by the signal fed through the driver DRIV. However, even if the brake is operated to turn ON the brake switch BK
SW, the level of the point A does not change and the alarm lamp ALM-LMP is kept in turned on
State.
Thus, the occurrence of the failure, such as the malfunction of the brake switch BK-SW in the stop lamp circuit 1, the breakage of the stop lamp STP
LMP, the breakage of the fuse F, the breakage of wire of the circuit on the like can be surely detected from the fact that the alarm lamp ALM-LMP does not turn off even if the brake is operated after the ignigition switch IG-SW is closed to turn on the alarm lamp ALM-LMP. Since the inspection is effected after the engine has been started, battery power is not drawn in the engine-off state. Furthermore, the detection of the occurrence of the failure in the stop lamp circuit 1 can be effected not only at the time of inspection before starting but also during running of the automobile.
The circuit shown in Figure 3 includes a lamp check switch CK-SW (push-button switch) which allows detection of the alarm lamp ALM-LMP as desired.
The described failure detection system for a stop-lamp circuit comprises a control circuit which is so constructed that the power circuit for the alarm lamp is formed to turn on the alarm lamp by closing the ignition switch and then the power circuit for the alarm lamp is broken by turning on the brake switch arranged in the stop lamp circuit. This system has the advantages that it allows easy detection of the occurrence of the failure in the stop lamp circuit as well as inspection of the alarm lamp itself.
Claims (5)
1. A failure detection system in a stop-lamp circuit which serves to turn on a stop lamp when braking operation normally involving turning on of a brake switch is effected; the system comprising means for detecting a state of malfunction of the stop lamp circuit and feeding an operation instruction to a driver means to drive an alarm means, and means for closing a power circuit for the alarm means to cause the alarm means to operate for a predetermined period set by a timer after closing of an ignition switch and opening the power circuit for the alarm means by turning ON the brake switch during the period set by the timer.
2. A failure detection system as claimed in claim 1, in which the stop lamp circuit has a relay coil and a reply contact arranged therein; an output signal of the relay contact, produced when the relay coil is deenergized owing to breakage of the circuit, being fed as an operation instruction for the alarm means.
3. A failure detection system as claimed in claim 1 or 2 and including first and second transistors arranged in the power circuit for the alarm means, the first transistor being turned ON to close the power circuit and the second transistor being turned ON after the predetermined period set by the timer consisting of an RC circuit when the ignition switch is closed, and the timer being released to turn ON the second transistor when the brake switch is turned ON during said predetermined period, whereby the first transistor is turned OFF and the power circuit for the alarm is opened.
4. A failure detection system as claimed in claim 1, 2 or 3, in which the alarm means consists of a lamp.
5. A failure detection system in a stop lamp circuit, substantially as hereinbefore described with reference to Figures 2 and 3 of the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19974284A JPS6181834A (en) | 1984-09-25 | 1984-09-25 | Abnormality detecting system for stop lamp system |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8522961D0 GB8522961D0 (en) | 1985-10-23 |
| GB2165109A true GB2165109A (en) | 1986-04-03 |
| GB2165109B GB2165109B (en) | 1987-10-14 |
Family
ID=16412873
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08522961A Expired GB2165109B (en) | 1984-09-25 | 1985-09-17 | Stop-lamp circuit failure detection system |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPS6181834A (en) |
| CA (1) | CA1259384A (en) |
| DE (1) | DE3533914A1 (en) |
| FR (1) | FR2570917B1 (en) |
| GB (1) | GB2165109B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2290621A (en) * | 1994-06-24 | 1996-01-03 | Reginald Laurence Haines | Means for verifying the functioning of a vehicle's brake lighting system |
| GR960100034A (en) * | 1996-02-02 | 1997-10-31 | / | Pulse switch for the brake lights of vehicles giving an indication of their status. |
| ES2107356A1 (en) * | 1994-12-23 | 1997-11-16 | Vera Jose Antonio Fernandez | Sequencer device detecting failures in the brake lights of a vehicle |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105857176A (en) * | 2016-04-15 | 2016-08-17 | 江苏理工学院 | Automatic failure detection system of automobile brake lamp and working method of automatic failure detection system |
| CN112874432B (en) * | 2021-02-08 | 2023-03-24 | 一汽解放汽车有限公司 | Brake lamp control system and method and driving equipment |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2650893A1 (en) * | 1976-11-06 | 1978-05-11 | Vdo Schindling | Control circuit for vehicle lights - has transistorised unit to differentiate between lamp and supply failure |
| DE2832556A1 (en) * | 1978-07-25 | 1980-02-14 | Bosch Gmbh Robert | Monitoring circuit for incandescent lamps in motor vehicles - has signal store connected to voltage divider also connected to lamp |
| US4214236A (en) * | 1978-10-02 | 1980-07-22 | The Bendix Corporation | Driver circuit for an electrical load with capability for detecting a short in the load |
| US4401972A (en) * | 1981-06-15 | 1983-08-30 | Sun Chemical Corporation | Stop-light monitor device |
| JPS5842192U (en) * | 1981-09-17 | 1983-03-19 | 嶋村 博 | embroidery frame |
| FR2499251B1 (en) * | 1982-01-29 | 1986-02-07 | Ml Engineering Plymouth Ltd | VOLTAGE LEVEL SENSOR CIRCUIT |
-
1984
- 1984-09-25 JP JP19974284A patent/JPS6181834A/en active Granted
-
1985
- 1985-09-04 CA CA000489965A patent/CA1259384A/en not_active Expired
- 1985-09-17 GB GB08522961A patent/GB2165109B/en not_active Expired
- 1985-09-23 DE DE19853533914 patent/DE3533914A1/en active Granted
- 1985-09-24 FR FR8514125A patent/FR2570917B1/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2290621A (en) * | 1994-06-24 | 1996-01-03 | Reginald Laurence Haines | Means for verifying the functioning of a vehicle's brake lighting system |
| ES2107356A1 (en) * | 1994-12-23 | 1997-11-16 | Vera Jose Antonio Fernandez | Sequencer device detecting failures in the brake lights of a vehicle |
| GR960100034A (en) * | 1996-02-02 | 1997-10-31 | / | Pulse switch for the brake lights of vehicles giving an indication of their status. |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2570917B1 (en) | 1987-12-18 |
| DE3533914A1 (en) | 1986-04-03 |
| CA1259384A (en) | 1989-09-12 |
| FR2570917A1 (en) | 1986-03-28 |
| DE3533914C2 (en) | 1988-03-17 |
| GB8522961D0 (en) | 1985-10-23 |
| JPH0251776B2 (en) | 1990-11-08 |
| GB2165109B (en) | 1987-10-14 |
| JPS6181834A (en) | 1986-04-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19920917 |